with the world series in san francisco, i'm lawrence scott. back to you in the studio. >> all right. good night. ♪ [ man ] excuse me miss. [ gasps ] this fiber one 90 calorie brownie has all the moist, chewy, deliciousness you desire. mmmm. thanks. [ man ] at 90 calories, the brownie of your dreams is now deliciously real. [ female announcer ] and now, try our new chocolate chip cookie 90 calorie brownie. >> good evening from the magnus arena at the university of denver in denver, colorado. i'm jim lehrer, anchor of the pbs news hour on your local public broadcasting station. thank you for joining us at the first of the 2012 presidential debates between